2 * Copyright (c) 2015 Brocade Communications Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.cluster.datastore.entityownership;
10 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_OWNERS_PATH;
11 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_QNAME;
12 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.createEntity;
13 import com.google.common.base.Objects;
14 import com.google.common.base.Optional;
15 import java.util.Collection;
16 import org.opendaylight.controller.cluster.datastore.ShardDataTree;
17 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
18 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.md.sal.clustering.entity.owners.rev150804.entity.owners.EntityType;
20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
21 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
22 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
23 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
24 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
25 import org.slf4j.Logger;
26 import org.slf4j.LoggerFactory;
29 * Listens for entity owner changes and notifies the EntityOwnershipListenerSupport appropriately.
31 * @author Thomas Pantelis
33 class EntityOwnerChangeListener implements DOMDataTreeChangeListener {
34 private static final Logger LOG = LoggerFactory.getLogger(EntityOwnerChangeListener.class);
36 private final String localMemberName;
37 private final EntityOwnershipListenerSupport listenerSupport;
39 EntityOwnerChangeListener(String localMemberName, EntityOwnershipListenerSupport listenerSupport) {
40 this.localMemberName = localMemberName;
41 this.listenerSupport = listenerSupport;
44 void init(ShardDataTree shardDataTree) {
45 shardDataTree.registerTreeChangeListener(YangInstanceIdentifier.builder(ENTITY_OWNERS_PATH).
46 node(EntityType.QNAME).node(EntityType.QNAME).node(ENTITY_QNAME).node(ENTITY_QNAME).node(EntityOwnersModel.ENTITY_OWNER_QNAME).build(), this);
50 public void onDataTreeChanged(Collection<DataTreeCandidate> changes) {
51 for(DataTreeCandidate change: changes) {
52 DataTreeCandidateNode changeRoot = change.getRootNode();
53 LeafNode<?> ownerLeaf = (LeafNode<?>) changeRoot.getDataAfter().get();
55 LOG.debug("{}: Entity node changed: {}, {}", logId(), changeRoot.getModificationType(), change.getRootPath());
57 String newOwner = extractOwner(ownerLeaf);
59 String origOwner = null;
60 Optional<NormalizedNode<?, ?>> dataBefore = changeRoot.getDataBefore();
61 if(dataBefore.isPresent()) {
62 origOwner = extractOwner((LeafNode<?>) changeRoot.getDataBefore().get());
65 LOG.debug("{}: New owner: {}, Original owner: {}", logId(), newOwner, origOwner);
67 if(!Objects.equal(origOwner, newOwner)) {
68 boolean isOwner = Objects.equal(localMemberName, newOwner);
69 boolean wasOwner = Objects.equal(localMemberName, origOwner);
70 boolean hasOwner = newOwner != null && !newOwner.toString().isEmpty();
72 Entity entity = createEntity(change.getRootPath());
74 LOG.debug("{}: Calling notifyEntityOwnershipListeners: entity: {}, wasOwner: {}, isOwner: {}, hasOwner: {}",
75 logId(), entity, wasOwner, isOwner, hasOwner);
77 listenerSupport.notifyEntityOwnershipListeners(entity, wasOwner, isOwner, hasOwner);
82 private static String extractOwner(LeafNode<?> ownerLeaf) {
83 Object value = ownerLeaf.getValue();
84 return value != null ? value.toString() : null;
87 private String logId() {
88 return listenerSupport.getLogId();